Electric cutouts prior to the OEM muffler might be an interesting idea if you did not want to do a full exhaust, but I dont think there will be much in power gains department. They are also prone to failure at times, depending on the quality of the gearing in the cutout.
I would not put them any close to the motor than the rear muffler area though if I were you, otherwise you risk significantly changing the exhaust flow criteria into the lean direction and dumping VERY hot exhaust under the car. Also, if you do it make sure you get two obviously for the exhaust setup these cars come with.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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